How to pass args to pods based on Ordinal Index in StatefulSets?

Question

Is it possible to pass different args to pods based on their ordinal index in StatefulSets? Didn\'t find the answer on the StatefulSets documentation. Thanks!

Answer 1

Recommended way, see https://kubernetes.io/docs/tasks/run-application/run-replicated-stateful-application/#statefulset

# Generate server-id from pod ordinal index.

[[ `hostname` =~ -([0-9]+)$ ]] || exit 1
ordinal=${BASH_REMATCH[1]}

# ${ordinal} now holds the replica number

server-id=$((100 + $ordinal))

# Copy appropriate conf.d files from config-map to emptyDir.
if [[ $ordinal -eq 0 ]]; then
  # do something
else
  # do something else
fi